/* SecretCorp - modern OSINT teaching site
   Author: Omar Santos
   Hand-crafted, no framework, dark "intel ops" aesthetic. */

:root {
  --bg: #07090d;
  --bg-elev: #0d1117;
  --bg-elev-2: #131a23;
  --border: #1f2a37;
  --border-strong: #2b3a4b;
  --text: #e6edf3;
  --text-muted: #9aa7b4;
  --text-dim: #6b7785;
  --accent: #22d3ee;       /* cyan */
  --accent-2: #34d399;     /* emerald */
  --accent-soft: rgba(34, 211, 238, 0.12);
  --danger: #f87171;
  --warning: #fbbf24;
  --radius: 14px;
  --radius-sm: 8px;
  --max-w: 1180px;
  --font-sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, "Noto Sans", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas,
    "Liberation Mono", "Courier New", monospace;
  --shadow-1: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.25);
  --shadow-2: 0 2px 4px rgba(0, 0, 0, 0.5), 0 18px 50px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 120ms ease;
}
a:hover, a:focus-visible { color: #67e8f9; text-decoration: underline; }

a:focus-visible, button:focus-visible, input:focus-visible, .card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin: 0 0 0.6em;
  color: #f3f7fb;
}
h1 { font-size: clamp(2.2rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.6rem, 3.4vw, 2.4rem); }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.05rem; }
p { margin: 0 0 1em; color: var(--text); }
small { color: var(--text-muted); }

ul, ol { padding-left: 1.25em; margin: 0 0 1em; }
li { margin-bottom: 0.35em; }

code, kbd {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--bg-elev-2);
  border: 1px solid var(--border);
  padding: 1px 6px;
  border-radius: 4px;
  color: #d6f1f8;
}

pre {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background: #05080c;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px 16px;
  overflow-x: auto;
  color: #c7e7ef;
}
pre code {
  background: transparent;
  border: 0;
  padding: 0;
  color: inherit;
}

/* Layout */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

section { padding: 88px 0; position: relative; }
section.tight { padding: 56px 0; }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-soft);
  border: 1px solid rgba(34, 211, 238, 0.25);
  border-radius: 999px;
  padding: 6px 12px;
  margin-bottom: 18px;
}
.eyebrow::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 10px var(--accent);
}

/* Top nav */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: saturate(160%) blur(10px);
  -webkit-backdrop-filter: saturate(160%) blur(10px);
  background: rgba(7, 9, 13, 0.72);
  border-bottom: 1px solid var(--border);
}
.site-nav .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 16px;
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  color: var(--text);
  letter-spacing: -0.01em;
}
.brand:hover { text-decoration: none; color: var(--text); }
.brand .logo {
  width: 28px; height: 28px;
  display: inline-grid; place-items: center;
  border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #03161a;
  font-family: var(--font-mono);
  font-weight: 900;
  font-size: 14px;
}
.brand .brand-mark { color: var(--accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0; padding: 0;
}
.nav-links a {
  display: inline-block;
  padding: 8px 12px;
  border-radius: 8px;
  color: var(--text-muted);
  font-size: 0.95rem;
  font-weight: 500;
}
.nav-links a:hover, .nav-links a:focus-visible {
  color: var(--text);
  background: var(--bg-elev);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: 8px;
  width: 40px; height: 40px;
  cursor: pointer;
}
.nav-toggle:hover { background: var(--bg-elev); }
.nav-toggle svg { width: 18px; height: 18px; }

@media (max-width: 760px) {
  .nav-toggle { display: inline-flex; align-items: center; justify-content: center; }
  .nav-links {
    position: absolute;
    top: 64px; left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--bg-elev);
    border-bottom: 1px solid var(--border);
    padding: 8px;
    display: none;
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px 14px; border-radius: 6px; }
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
  padding: 110px 0 90px;
  border-bottom: 1px solid var(--border);
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 20% 0%, rgba(34, 211, 238, 0.16), transparent 60%),
    radial-gradient(50% 40% at 80% 10%, rgba(52, 211, 153, 0.12), transparent 60%),
    linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.4));
  pointer-events: none;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 44px 44px;
  mask-image: radial-gradient(70% 60% at 50% 30%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(70% 60% at 50% 30%, #000 30%, transparent 80%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 56px;
  align-items: center;
}
@media (max-width: 920px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
}

.hero h1 {
  background: linear-gradient(180deg, #ffffff 0%, #b9d8e0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .lede {
  font-size: clamp(1.05rem, 1.6vw, 1.18rem);
  color: var(--text-muted);
  max-width: 60ch;
}
.hero .cta-row {
  display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px;
}

/* Hero visual (inline SVG card) */
.hero-visual {
  position: relative;
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-elev-2));
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow-2);
  padding: 18px;
}
.hero-visual .terminal-bar {
  display: flex; align-items: center; gap: 6px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 12px;
}
.hero-visual .dot { width: 10px; height: 10px; border-radius: 50%; background: #ff5f56; }
.hero-visual .dot.y { background: #ffbd2e; }
.hero-visual .dot.g { background: #27c93f; }
.hero-visual .term-title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-dim);
}
.hero-visual pre { background: transparent; border: 0; padding: 4px 4px 0; font-size: 0.88rem; }
.hero-visual .prompt { color: var(--accent-2); }
.hero-visual .flag   { color: var(--accent); }
.hero-visual .comment{ color: var(--text-dim); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 10px;
  font-weight: 600;
  font-size: 0.98rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease, color 120ms ease;
  text-decoration: none;
  line-height: 1;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #03161a;
}
.btn-primary:hover { color: #03161a; filter: brightness(1.05); }
.btn-ghost {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text);
}
.btn-ghost:hover { background: var(--bg-elev); color: var(--text); }
.btn-sm { padding: 8px 12px; font-size: 0.88rem; border-radius: 8px; }

/* Section heading */
.section-head {
  display: flex; flex-direction: column; gap: 8px;
  margin-bottom: 40px;
  max-width: 720px;
}
.section-head.center { margin-left: auto; margin-right: auto; text-align: center; align-items: center; }
.section-head p { color: var(--text-muted); margin: 0; }

/* Cards grid */
.grid {
  display: grid;
  gap: 20px;
}
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
@media (max-width: 920px) {
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 600px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
}

.card {
  position: relative;
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-elev-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: transform 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
  display: flex; flex-direction: column; gap: 10px;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-1);
}
.card .icon {
  width: 40px; height: 40px;
  display: inline-grid; place-items: center;
  border-radius: 10px;
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid rgba(34, 211, 238, 0.25);
}
.card .icon svg { width: 20px; height: 20px; }
.card h3 { margin: 4px 0 2px; color: #eaf3f8; }
.card p { color: var(--text-muted); margin: 0; }
.card .card-link {
  margin-top: auto;
  padding-top: 12px;
  display: inline-flex; align-items: center; gap: 6px;
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}
.card .card-link::after {
  content: "→";
  transition: transform 160ms ease;
}
.card:hover .card-link::after { transform: translateX(3px); }

/* Clue / callout */
.callout {
  background: linear-gradient(180deg, rgba(34, 211, 238, 0.06), transparent);
  border: 1px solid rgba(34, 211, 238, 0.22);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px 22px;
}
.callout.warning {
  background: linear-gradient(180deg, rgba(251, 191, 36, 0.06), transparent);
  border-color: rgba(251, 191, 36, 0.25);
  border-left-color: var(--warning);
}
.callout h4 { margin: 0 0 6px; color: var(--text); }
.callout p:last-child { margin-bottom: 0; }

/* Code block with copy */
.codeblock {
  position: relative;
  background: #05080c;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin: 12px 0;
}
.codeblock pre {
  border: 0;
  border-radius: var(--radius-sm);
  padding-right: 60px;
}
.codeblock .copy-btn {
  position: absolute;
  top: 8px; right: 8px;
  background: var(--bg-elev);
  border: 1px solid var(--border-strong);
  color: var(--text-muted);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 0.78rem;
  font-family: var(--font-mono);
  cursor: pointer;
  transition: color 120ms, background 120ms;
}
.codeblock .copy-btn:hover { color: var(--text); background: var(--bg-elev-2); }
.codeblock .copy-btn.copied { color: var(--accent-2); border-color: rgba(52, 211, 153, 0.4); }

/* Decoder widget */
.decoder {
  margin-top: 16px;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 14px;
  display: grid; gap: 10px;
}
.decoder label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-dim);
}
.decoder textarea, .decoder input[type="text"] {
  width: 100%;
  background: #05080c;
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  resize: vertical;
}
.decoder textarea { min-height: 70px; }
.decoder .row { display: flex; gap: 8px; flex-wrap: wrap; }
.decoder .out {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  background: #05080c;
  border: 1px dashed var(--border-strong);
  border-radius: 6px;
  padding: 10px 12px;
  min-height: 40px;
  white-space: pre-wrap;
  word-break: break-all;
  color: var(--accent-2);
}

/* Step list */
.steps {
  counter-reset: step;
  list-style: none;
  padding: 0;
  display: grid;
  gap: 16px;
}
.steps li {
  counter-increment: step;
  position: relative;
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 16px 18px 16px 60px;
  margin: 0;
}
.steps li::before {
  content: counter(step);
  position: absolute;
  left: 14px; top: 14px;
  width: 32px; height: 32px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: var(--accent-soft);
  border: 1px solid rgba(34, 211, 238, 0.3);
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.9rem;
}
.steps li strong { color: var(--text); }

/* Tag list */
.tags { display: flex; flex-wrap: wrap; gap: 6px; }
.tag {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text-muted);
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 3px 10px;
}

/* Author block */
.author {
  display: flex; gap: 18px; align-items: center;
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-elev-2));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.author .avatar {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #03161a;
  display: grid; place-items: center;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 1.25rem;
  flex-shrink: 0;
}
.author h3 { margin: 0 0 4px; }
.author p { margin: 0; color: var(--text-muted); }

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elev);
  padding: 40px 0 32px;
  color: var(--text-muted);
  font-size: 0.92rem;
}
.site-footer .container {
  display: flex; flex-wrap: wrap;
  align-items: center; justify-content: space-between;
  gap: 16px;
}
.site-footer a { color: var(--text-muted); }
.site-footer a:hover { color: var(--text); }
.footer-links { display: flex; gap: 18px; flex-wrap: wrap; }

/* Helpers */
.text-muted { color: var(--text-muted); }
.text-dim { color: var(--text-dim); }
.mt-0 { margin-top: 0 !important; }
.mb-0 { margin-bottom: 0 !important; }
.center { text-align: center; }

/* Inline screenshot inside a card */
.card-figure {
  margin: 4px 0 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #05080c;
}
.card-figure img {
  width: 100%;
  height: auto;
  display: block;
}

/* Hidden-page hero variant */
.page-hero {
  padding: 80px 0 40px;
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(50% 50% at 50% 0%, rgba(34, 211, 238, 0.10), transparent 70%);
  pointer-events: none;
}
.page-hero .container { position: relative; z-index: 1; }

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition: none !important;
    animation: none !important;
  }
  html { scroll-behavior: auto; }
}